package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    @Override
    public Result sendCode(String phone, HttpSession session) {
        //校验手机号
        if(RegexUtils.isPhoneInvalid(phone)){
            return Result.fail("手机号格式错误");
        }
        //生成验证码
        String code = RandomUtil.randomNumbers(6);
        //保存验证码到redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //发送验证码
        log.debug("发送验证码成功，验证码：{}",code);
        return Result.ok("发送验证码成功");
    }
    @Override
    public Result login(LoginFormDTO LoginDTO, HttpSession session) {
        String phone = LoginDTO.getPhone();
        //.校验手机号
        if(RegexUtils.isPhoneInvalid(phone)){
            return Result.fail("手机号格式错误");
        }
        //校验验证码
        String redisCode =stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY+phone);
        if(redisCode == null || !redisCode.equals(LoginDTO.getCode())){
            return Result.fail("验证码错误");
        }
        //根据手机号查询用户
        User user = query().eq("phone", phone).one();
        if(user == null){
            //创建新用户
            user = createUserWithPhone(phone);
        }
        //随机生成token
        String token = UUID.randomUUID().toString();
        //保存用户到redis
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create().setIgnoreNullValue(true).setFieldValueEditor((s, o) -> o.toString()));
        stringRedisTemplate.opsForHash().putAll(LOGIN_USER_KEY+token,userMap);
        stringRedisTemplate.expire(LOGIN_USER_KEY+token,LOGIN_USER_TTL,TimeUnit.MINUTES);
        return Result.ok(token);
    }

    @Override
    public Result sign() {
        Long userId = UserHolder.getUser().getId();
        LocalDateTime now = LocalDateTime.now();
        String key = "sign:"+userId+now;
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        int datofMonth = now.getDayOfMonth();
        stringRedisTemplate.opsForValue().setBit(key,datofMonth-1,true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        Long userId = UserHolder.getUser().getId();
        LocalDateTime now = LocalDateTime.now();
        String key = "sign:"+userId+now;
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        int datofMonth = now.getDayOfMonth();
        List<Long> result = stringRedisTemplate.opsForValue().bitField(key,
                BitFieldSubCommands.create().get(BitFieldSubCommands.BitFieldType.unsigned(datofMonth)).valueAt(0));
        if(result==null||result.isEmpty()){
            return Result.ok(0);
        }
        Long num = result.get(0);
        if(num==null){
            return Result.ok(0);
        }
        int count = 0;
        while (true){
            if((num&1)==0){
                break;
            }else{
                count++;
            }
            num>>>=1;
        }
        return Result.ok(count);
    }

    private User createUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));
        save(user);
        return user;
    }
}
